Dissociative excitation of HeH sup + by electron impact
- Department of Applied Science, University of California, Davis, Livermore, California (USA)
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California (USA)
We report the results of an {ital ab} {ital initio} variational treatment of electron-impact cross sections for the process {ital e}{sup {minus}}+HeH{sup +}{r arrow}{ital e}{sup {minus}}+He{sup +}+H for electron energies between 21 eV, the threshold for excitation of the dissociative 1 {sup 3}{Sigma}{sup +} state, and 26 eV, corresponding to the excitation energy of the first {sup 1}{Sigma}{sup +} excited state. The calculations, which were carried out using a recent modification of the complex Kohn method, employed accurate correlated target wave functions, as well as {ital ab} {ital initio} optical potentials to incorporate the effect of closed channels. The fixed-nuclei excitation cross sections were found to be dominated by a series of sharp resonance structures. However, when the cross sections are averaged over the Franck-Condon envelope of the ground vibrational state, these sharp features are no longer seen. We conclude that the recent experiments that report structure in the HeH{sup +} dissociation cross section cannot be explained within the context of traditional adiabatic-nuclei theory.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5151344
- Journal Information:
- Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 44:7; ISSN 1050-2947; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CROSS SECTIONS
DISSOCIATION
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FUNCTIONS
GROUND STATES
ION COLLISIONS
MOLECULAR STRUCTURE
PARTIAL WAVES
VARIATIONAL METHODS
VIBRATIONAL STATES
WAVE FUNCTIONS